m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 149

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.8.10. USB Attach/Detach register
This register is used to control attach/detach from the USB host without physically attaching/detaching
the USB cable.
•Port 9
•Attach/detach bit
•Vbus detect enable bit
When attach/detach bit is changed from “0” to “1” or from “1” to “0”, time required till the host recog-
nizes attach/detach varies according to board resistance factor/ capacity factor/ USB cable capacity of
the device, host's board characteristics, and processing speed. Perform sufficient evaluation through
controlling attach/detach bit in accordance with the actual user's system.
The configuration of USB attach/detach register is shown in Figure 2.8.10.
USB attach/detach register
USB Attach/Detach Register
b7 b6 b5 b4 b3 b2 b1 b0
The port P9
between the USB D+ pin and the Uvcc pin. (The timing of D+ line pull-up is depending on the Uvcc
pin.)
When this bit is set to “1”, the P9
pin for pull-up to the D+ line. When using the USB attach/detach function, be sure to connect be-
tween the USB D+ pin and the P9
be sure to connect the UVcc pin to the power source.
This bit is valid when port 9
voltage to P9
to “1”, the USB cable becomes a attach state artificially since the Uvcc pin voltage is supplied to the
P9
This bit is used to enable Vbus detection by setting to “1”. When enabling the Vbus detection, con-
nect the Vbus pin of USB connector to a VbusDTCT pin.
0
0
and D+ line is pulled up. After frequency synthesizer is stabilized, set “1” (attach state) to this bit.
0
0
-Second bit
0
0
0
0
page 140 of 354
0
operates as standard port when this bit is set to “0”. Connect a 1.5k
is stopped and the USB cable becomes a detach state artificially. When this bit is set
Bit symbol
Reserved
P9
VBDT
Attach/
Detach
Symbol
USBAD
0-
second
0
-Second bit is set to “1”. When this bit is set to “0”, supply of UVcc pin
Attach/Detach
Port 9
Vbus detect enable
0
0
has the USB attach/detach function, serving as the power supply
0
/ATTACH pin via a 1.5k pull-up resistance. Also, in either case,
-Second
Bit name
Address
0 : Normal mode for Port 9
1 : Forces Port 9
001F
0 : ATTACH
1 : DETACH
0 : Disabled
1 : Enabled
Must always be set to “0”
16
0
to operate as pull up for D+.
Function
When reset
00
0
16
2. USB function
resistance
R
W